(2 people recommended)
Each person needs to buy 1 cabbage.
Take any portal to any black zone at the conquerors' hall in a city.
Leave the starting zone into a pvp area at the same time.
Quickly trade the cabbages to each other before your protection goes away.
Leave the pvp zone and enter the portal back to your city.
Tips:
Only bring the cabbages since this is a pvp zone where you will drop your items if you die.
You can combine this with the Welcome to Albion achievement by dying to someone. (if you havent gotten it yet)
I wouldnt recommend trying this with strangers since they would probably just kill you and take the cabbage.